Orp

[BJcorals]

On my apex I pay attention to the orp a lot. I’ve notice in the past couple of day it’s gone down from 370-250 but it will also come up through out the day but drop back down. I don’t run ozone. So I’ve been wondering if it’s because I’ve been letting my skimmer just bubble back into the tank because I’ve been trying to get my nitrates up from 1.0 to 4.0 and I’m just about there. I just don’t know when I should run my skimmer properly again to maintain my nitrates. I guess my really question is should I be worried about my orp being lower?

 

[Tastee]

Mine drops 10 points during the day and bounces back overnight but I have never had mine higher than 260 so I’m impressed with 370. I have a 65g mixed reef, coming on 2 years old.

I treat my reading as an overall water quality health indicator. When it drops I take it that things are going out of whack and when it gradually increases I take as a good sign I am doing the right things. Mine drop a fair bit at each monthly WC (20-25 points) and bounce back a week or two after that. I find the more GHA and other unwanteds I have in the tank the lower the ORP is.

Mine at the moment consistently rise each week. I’m tending to gain 2-4 points per day. This correlates with my algae being gradually cleaned up by my CUC.

 

[Waters]

Unless you are running ozone, OPR is pretty worthless to monitor unfortunately IMO. I used to watch my Apex probe also......I can't even tell you the last time I looked at that number. Here is a good article from @Randy Holmes-Farley if you want to read through it. http://www.reefkeeping.com/issues/2003-12/rhf/feature/index.php